// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
 *  Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
 *  Copyright(C) 2006-2007  Timesys Corp., Thomas Gleixner
 *
 *  High-resolution kernel timers
 *
 *  In contrast to the low-resolution timeout API, aka timer wheel,
 *  hrtimers provide finer resolution and accuracy depending on system
 *  configuration and capabilities.
 *
 *  Started by: Thomas Gleixner and Ingo Molnar
 *
 *  Credits:
 *	Based on the original timer wheel code
 *
 *	Help, testing, suggestions, bugfixes, improvements were
 *	provided by:
 *
 *	George Anzinger, Andrew Morton, Steven Rostedt, Roman Zippel
 *	et. al.
 */

#include <generated/deconfig.h>
#include <linux/cpu.h>
#include <linux/export.h>
#include <linux/percpu.h>
#include <linux/hrtimer.h>
#include <linux/notifier.h>
#include <linux/syscalls.h>
#include <linux/interrupt.h>
#include <linux/tick.h>
#include <linux/err.h>
#include <linux/debugobjects.h>
#include <linux/sched/signal.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/rt.h>
#include <linux/sched/deadline.h>
#include <linux/sched/nohz.h>
#include <linux/sched/debug.h>
#include <linux/timer.h>
#include <linux/freezer.h>
#include <linux/compat.h>

#include <linux/uaccess.h>

#include <trace/events/timer.h>

#include "tick-internal.h"

///*
// * Masks for selecting the soft and hard context timers from
// * cpu_base->active
// */
//#define MASK_SHIFT		(HRTIMER_BASE_MONOTONIC_SOFT)
//#define HRTIMER_ACTIVE_HARD	((1U << MASK_SHIFT) - 1)
//#define HRTIMER_ACTIVE_SOFT	(HRTIMER_ACTIVE_HARD << MASK_SHIFT)
//#define HRTIMER_ACTIVE_ALL	(HRTIMER_ACTIVE_SOFT | HRTIMER_ACTIVE_HARD)

///*
// * The timer bases:
// *
// * There are more clockids than hrtimer bases. Thus, we index
// * into the timer bases by the hrtimer_base_type enum. When trying
// * to reach a base using a clockid, hrtimer_clockid_to_base()
// * is used to convert from clockid to the proper hrtimer_base_type.
// */
//DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
//{
//	.lock = __RAW_SPIN_LOCK_UNLOCKED(hrtimer_bases.lock),
//	.clock_base =
//	{
//		{
//			.index = HRTIMER_BASE_MONOTONIC,
//			.clockid = CLOCK_MONOTONIC,
//			.get_time = &ktime_get,
//		},
//		{
//			.index = HRTIMER_BASE_REALTIME,
//			.clockid = CLOCK_REALTIME,
//			.get_time = &ktime_get_real,
//		},
//		{
//			.index = HRTIMER_BASE_BOOTTIME,
//			.clockid = CLOCK_BOOTTIME,
//			.get_time = &ktime_get_boottime,
//		},
//		{
//			.index = HRTIMER_BASE_TAI,
//			.clockid = CLOCK_TAI,
//			.get_time = &ktime_get_clocktai,
//		},
//		{
//			.index = HRTIMER_BASE_MONOTONIC_SOFT,
//			.clockid = CLOCK_MONOTONIC,
//			.get_time = &ktime_get,
//		},
//		{
//			.index = HRTIMER_BASE_REALTIME_SOFT,
//			.clockid = CLOCK_REALTIME,
//			.get_time = &ktime_get_real,
//		},
//		{
//			.index = HRTIMER_BASE_BOOTTIME_SOFT,
//			.clockid = CLOCK_BOOTTIME,
//			.get_time = &ktime_get_boottime,
//		},
//		{
//			.index = HRTIMER_BASE_TAI_SOFT,
//			.clockid = CLOCK_TAI,
//			.get_time = &ktime_get_clocktai,
//		},
//	}
//};

//static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
//	/* Make sure we catch unsupported clockids */
//	[0 ... MAX_CLOCKS - 1]	= HRTIMER_MAX_CLOCK_BASES,

//	[CLOCK_REALTIME]	= HRTIMER_BASE_REALTIME,
//	[CLOCK_MONOTONIC]	= HRTIMER_BASE_MONOTONIC,
//	[CLOCK_BOOTTIME]	= HRTIMER_BASE_BOOTTIME,
//	[CLOCK_TAI]		= HRTIMER_BASE_TAI,
//};

///*
// * Functions and macros which are different for UP/SMP systems are kept in a
// * single place
// */
//#ifdef CONFIG_SMP

///*
// * We require the migration_base for lock_hrtimer_base()/switch_hrtimer_base()
// * such that hrtimer_callback_running() can unconditionally dereference
// * timer->base->cpu_base
// */
//static struct hrtimer_cpu_base migration_cpu_base = {
//	.clock_base = { {
//		.cpu_base = &migration_cpu_base,
//		.seq      = SEQCNT_RAW_SPINLOCK_ZERO(migration_cpu_base.seq,
//						     &migration_cpu_base.lock),
//	}, },
//};

//#define migration_base	migration_cpu_base.clock_base[0]

//static inline bool is_migration_base(struct hrtimer_clock_base *base)
//{
//	return base == &migration_base;
//}

///*
// * We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock
// * means that all timers which are tied to this base via timer->base are
// * locked, and the base itself is locked too.
// *
// * So __run_timers/migrate_timers can safely modify all timers which could
// * be found on the lists/queues.
// *
// * When the timer's base is locked, and the timer removed from list, it is
// * possible to set timer->base = &migration_base and drop the lock: the timer
// * remains locked.
// */
//static
//struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
//					     unsigned long *flags)
//{
//	struct hrtimer_clock_base *base;

//	for (;;) {
//		base = READ_ONCE(timer->base);
//		if (likely(base != &migration_base)) {
//			raw_spin_lock_irqsave(&base->cpu_base->lock, *flags);
//			if (likely(base == timer->base))
//				return base;
//			/* The timer has migrated to another CPU: */
//			raw_spin_unlock_irqrestore(&base->cpu_base->lock, *flags);
//		}
//		cpu_relax();
//	}
//}

///*
// * We do not migrate the timer when it is expiring before the next
// * event on the target cpu. When high resolution is enabled, we cannot
// * reprogram the target cpu hardware and we would cause it to fire
// * late. To keep it simple, we handle the high resolution enabled and
// * disabled case similar.
// *
// * Called with cpu_base->lock of target cpu held.
// */
//static int
//hrtimer_check_target(struct hrtimer *timer, struct hrtimer_clock_base *new_base)
//{
//	ktime_t expires;

//	expires = ktime_sub(hrtimer_get_expires(timer), new_base->offset);
//	return expires < new_base->cpu_base->expires_next;
//}

//static inline
//struct hrtimer_cpu_base *get_target_base(struct hrtimer_cpu_base *base,
//					 int pinned)
//{
//#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
//	if (static_branch_likely(&timers_migration_enabled) && !pinned)
//		return &per_cpu(hrtimer_bases, get_nohz_timer_target());
//#endif
//	return base;
//}

///*
// * We switch the timer base to a power-optimized selected CPU target,
// * if:
// *	- NO_HZ_COMMON is enabled
// *	- timer migration is enabled
// *	- the timer callback is not running
// *	- the timer is not the first expiring timer on the new target
// *
// * If one of the above requirements is not fulfilled we move the timer
// * to the current CPU or leave it on the previously assigned CPU if
// * the timer callback is currently running.
// */
//static inline struct hrtimer_clock_base *
//switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base,
//		    int pinned)
//{
//	struct hrtimer_cpu_base *new_cpu_base, *this_cpu_base;
//	struct hrtimer_clock_base *new_base;
//	int basenum = base->index;

//	this_cpu_base = this_cpu_ptr(&hrtimer_bases);
//	new_cpu_base = get_target_base(this_cpu_base, pinned);
//again:
//	new_base = &new_cpu_base->clock_base[basenum];

//	if (base != new_base) {
//		/*
//		 * We are trying to move timer to new_base.
//		 * However we can't change timer's base while it is running,
//		 * so we keep it on the same CPU. No hassle vs. reprogramming
//		 * the event source in the high resolution case. The softirq
//		 * code will take care of this when the timer function has
//		 * completed. There is no conflict as we hold the lock until
//		 * the timer is enqueued.
//		 */
//		if (unlikely(hrtimer_callback_running(timer)))
//			return base;

//		/* See the comment in lock_hrtimer_base() */
//		WRITE_ONCE(timer->base, &migration_base);
//		raw_spin_unlock(&base->cpu_base->lock);
//		raw_spin_lock(&new_base->cpu_base->lock);

//		if (new_cpu_base != this_cpu_base &&
//		    hrtimer_check_target(timer, new_base)) {
//			raw_spin_unlock(&new_base->cpu_base->lock);
//			raw_spin_lock(&base->cpu_base->lock);
//			new_cpu_base = this_cpu_base;
//			WRITE_ONCE(timer->base, base);
//			goto again;
//		}
//		WRITE_ONCE(timer->base, new_base);
//	} else {
//		if (new_cpu_base != this_cpu_base &&
//		    hrtimer_check_target(timer, new_base)) {
//			new_cpu_base = this_cpu_base;
//			goto again;
//		}
//	}
//	return new_base;
//}

//#else /* CONFIG_SMP */

//static inline bool is_migration_base(struct hrtimer_clock_base *base)
//{
//	return false;
//}

//static inline struct hrtimer_clock_base *
//lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
//{
//	struct hrtimer_clock_base *base = timer->base;

//	raw_spin_lock_irqsave(&base->cpu_base->lock, *flags);

//	return base;
//}

//# define switch_hrtimer_base(t, b, p)	(b)

//#endif	/* !CONFIG_SMP */

/*
 * Functions for the union type storage format of ktime_t which are
 * too large for inlining:
 */
#if BITS_PER_LONG < 64
/*
 * Divide a ktime value by a nanosecond value
 */
s64 __ktime_divns(const ktime_t kt, s64 div)
{
	int sft = 0;
	s64 dclc;
	u64 tmp;

	dclc = ktime_to_ns(kt);
	tmp = dclc < 0 ? -dclc : dclc;

	/* Make sure the divisor is less than 2^32: */
	while (div >> 32) {
		sft++;
		div >>= 1;
	}
	tmp >>= sft;
	do_div(tmp, (u32) div);
	return dclc < 0 ? -tmp : tmp;
}
EXPORT_SYMBOL_GPL(__ktime_divns);
#endif /* BITS_PER_LONG >= 64 */

///*
// * Add two ktime values and do a safety check for overflow:
// */
//ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs)
//{
//	ktime_t res = ktime_add_unsafe(lhs, rhs);

//	/*
//	 * We use KTIME_SEC_MAX here, the maximum timeout which we can
//	 * return to user space in a timespec:
//	 */
//	if (res < 0 || res < lhs || res < rhs)
//		res = ktime_set(KTIME_SEC_MAX, 0);

//	return res;
//}

//EXPORT_SYMBOL_GPL(ktime_add_safe);

//#ifdef CONFIG_DEBUG_OBJECTS_TIMERS

//static const struct debug_obj_descr hrtimer_debug_descr;

//static void *hrtimer_debug_hint(void *addr)
//{
//	return ((struct hrtimer *) addr)->function;
//}

///*
// * fixup_init is called when:
// * - an active object is initialized
// */
//static bool hrtimer_fixup_init(void *addr, enum debug_obj_state state)
//{
//	struct hrtimer *timer = addr;

//	switch (state) {
//	case ODEBUG_STATE_ACTIVE:
//		hrtimer_cancel(timer);
//		debug_object_init(timer, &hrtimer_debug_descr);
//		return true;
//	default:
//		return false;
//	}
//}

///*
// * fixup_activate is called when:
// * - an active object is activated
// * - an unknown non-static object is activated
// */
//static bool hrtimer_fixup_activate(void *addr, enum debug_obj_state state)
//{
//	switch (state) {
//	case ODEBUG_STATE_ACTIVE:
//		WARN_ON(1);
//		fallthrough;
//	default:
//		return false;
//	}
//}

///*
// * fixup_free is called when:
// * - an active object is freed
// */
//static bool hrtimer_fixup_free(void *addr, enum debug_obj_state state)
//{
//	struct hrtimer *timer = addr;

//	switch (state) {
//	case ODEBUG_STATE_ACTIVE:
//		hrtimer_cancel(timer);
//		debug_object_free(timer, &hrtimer_debug_descr);
//		return true;
//	default:
//		return false;
//	}
//}

//static const struct debug_obj_descr hrtimer_debug_descr = {
//	.name		= "hrtimer",
//	.debug_hint	= hrtimer_debug_hint,
//	.fixup_init	= hrtimer_fixup_init,
//	.fixup_activate	= hrtimer_fixup_activate,
//	.fixup_free	= hrtimer_fixup_free,
//};

//static inline void debug_hrtimer_init(struct hrtimer *timer)
//{
//	debug_object_init(timer, &hrtimer_debug_descr);
//}

//static inline void debug_hrtimer_activate(struct hrtimer *timer,
//					  enum hrtimer_mode mode)
//{
//	debug_object_activate(timer, &hrtimer_debug_descr);
//}

//static inline void debug_hrtimer_deactivate(struct hrtimer *timer)
//{
//	debug_object_deactivate(timer, &hrtimer_debug_descr);
//}

//static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
//			   enum hrtimer_mode mode);

//void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t clock_id,
//			   enum hrtimer_mode mode)
//{
//	debug_object_init_on_stack(timer, &hrtimer_debug_descr);
//	__hrtimer_init(timer, clock_id, mode);
//}
//EXPORT_SYMBOL_GPL(hrtimer_init_on_stack);

//static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
//				   clockid_t clock_id, enum hrtimer_mode mode);

//void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl,
//				   clockid_t clock_id, enum hrtimer_mode mode)
//{
//	debug_object_init_on_stack(&sl->timer, &hrtimer_debug_descr);
//	__hrtimer_init_sleeper(sl, clock_id, mode);
//}
//EXPORT_SYMBOL_GPL(hrtimer_init_sleeper_on_stack);

//void destroy_hrtimer_on_stack(struct hrtimer *timer)
//{
//	debug_object_free(timer, &hrtimer_debug_descr);
//}
//EXPORT_SYMBOL_GPL(destroy_hrtimer_on_stack);

//#else

//static inline void debug_hrtimer_init(struct hrtimer *timer) { }
//static inline void debug_hrtimer_activate(struct hrtimer *timer,
//					  enum hrtimer_mode mode) { }
//static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { }
//#endif

//static inline void
//debug_init(struct hrtimer *timer, clockid_t clockid,
//	   enum hrtimer_mode mode)
//{
//	debug_hrtimer_init(timer);
//	trace_hrtimer_init(timer, clockid, mode);
//}

//static inline void debug_activate(struct hrtimer *timer,
//				  enum hrtimer_mode mode)
//{
//	debug_hrtimer_activate(timer, mode);
//	trace_hrtimer_start(timer, mode);
//}

//static inline void debug_deactivate(struct hrtimer *timer)
//{
//	debug_hrtimer_deactivate(timer);
//	trace_hrtimer_cancel(timer);
//}

//static struct hrtimer_clock_base *
//__next_base(struct hrtimer_cpu_base *cpu_base, unsigned int *active)
//{
//	unsigned int idx;

//	if (!*active)
//		return NULL;

//	idx = __ffs(*active);
//	*active &= ~(1U << idx);

//	return &cpu_base->clock_base[idx];
//}

//#define for_each_active_base(base, cpu_base, active)	\
//	while ((base = __next_base((cpu_base), &(active))))

//static ktime_t __hrtimer_next_event_base(struct hrtimer_cpu_base *cpu_base,
//					 const struct hrtimer *exclude,
//					 unsigned int active,
//					 ktime_t expires_next)
//{
//	struct hrtimer_clock_base *base;
//	ktime_t expires;

//	for_each_active_base(base, cpu_base, active) {
//		struct timerqueue_node *next;
//		struct hrtimer *timer;

//		next = timerqueue_getnext(&base->active);
//		timer = container_of(next, struct hrtimer, node);
//		if (timer == exclude) {
//			/* Get to the next timer in the queue. */
//			next = timerqueue_iterate_next(next);
//			if (!next)
//				continue;

//			timer = container_of(next, struct hrtimer, node);
//		}
//		expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
//		if (expires < expires_next) {
//			expires_next = expires;

//			/* Skip cpu_base update if a timer is being excluded. */
//			if (exclude)
//				continue;

//			if (timer->is_soft)
//				cpu_base->softirq_next_timer = timer;
//			else
//				cpu_base->next_timer = timer;
//		}
//	}
//	/*
//	 * clock_was_set() might have changed base->offset of any of
//	 * the clock bases so the result might be negative. Fix it up
//	 * to prevent a false positive in clockevents_program_event().
//	 */
//	if (expires_next < 0)
//		expires_next = 0;
//	return expires_next;
//}

///*
// * Recomputes cpu_base::*next_timer and returns the earliest expires_next
// * but does not set cpu_base::*expires_next, that is done by
// * hrtimer[_force]_reprogram and hrtimer_interrupt only. When updating
// * cpu_base::*expires_next right away, reprogramming logic would no longer
// * work.
// *
// * When a softirq is pending, we can ignore the HRTIMER_ACTIVE_SOFT bases,
// * those timers will get run whenever the softirq gets handled, at the end of
// * hrtimer_run_softirq(), hrtimer_update_softirq_timer() will re-add these bases.
// *
// * Therefore softirq values are those from the HRTIMER_ACTIVE_SOFT clock bases.
// * The !softirq values are the minima across HRTIMER_ACTIVE_ALL, unless an actual
// * softirq is pending, in which case they're the minima of HRTIMER_ACTIVE_HARD.
// *
// * @active_mask must be one of:
// *  - HRTIMER_ACTIVE_ALL,
// *  - HRTIMER_ACTIVE_SOFT, or
// *  - HRTIMER_ACTIVE_HARD.
// */
//static ktime_t
//__hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base, unsigned int active_mask)
//{
//	unsigned int active;
//	struct hrtimer *next_timer = NULL;
//	ktime_t expires_next = KTIME_MAX;

//	if (!cpu_base->softirq_activated && (active_mask & HRTIMER_ACTIVE_SOFT)) {
//		active = cpu_base->active_bases & HRTIMER_ACTIVE_SOFT;
//		cpu_base->softirq_next_timer = NULL;
//		expires_next = __hrtimer_next_event_base(cpu_base, NULL,
//							 active, KTIME_MAX);

//		next_timer = cpu_base->softirq_next_timer;
//	}

//	if (active_mask & HRTIMER_ACTIVE_HARD) {
//		active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD;
//		cpu_base->next_timer = next_timer;
//		expires_next = __hrtimer_next_event_base(cpu_base, NULL, active,
//							 expires_next);
//	}

//	return expires_next;
//}

//static ktime_t hrtimer_update_next_event(struct hrtimer_cpu_base *cpu_base)
//{
//	ktime_t expires_next, soft = KTIME_MAX;

//	/*
//	 * If the soft interrupt has already been activated, ignore the
//	 * soft bases. They will be handled in the already raised soft
//	 * interrupt.
//	 */
//	if (!cpu_base->softirq_activated) {
//		soft = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_SOFT);
//		/*
//		 * Update the soft expiry time. clock_settime() might have
//		 * affected it.
//		 */
//		cpu_base->softirq_expires_next = soft;
//	}

//	expires_next = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_HARD);
//	/*
//	 * If a softirq timer is expiring first, update cpu_base->next_timer
//	 * and program the hardware with the soft expiry time.
//	 */
//	if (expires_next > soft) {
//		cpu_base->next_timer = cpu_base->softirq_next_timer;
//		expires_next = soft;
//	}

//	return expires_next;
//}

//static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
//{
//	ktime_t *offs_real = &base->clock_base[HRTIMER_BASE_REALTIME].offset;
//	ktime_t *offs_boot = &base->clock_base[HRTIMER_BASE_BOOTTIME].offset;
//	ktime_t *offs_tai = &base->clock_base[HRTIMER_BASE_TAI].offset;

//	ktime_t now = ktime_get_update_offsets_now(&base->clock_was_set_seq,
//					    offs_real, offs_boot, offs_tai);

//	base->clock_base[HRTIMER_BASE_REALTIME_SOFT].offset = *offs_real;
//	base->clock_base[HRTIMER_BASE_BOOTTIME_SOFT].offset = *offs_boot;
//	base->clock_base[HRTIMER_BASE_TAI_SOFT].offset = *offs_tai;

//	return now;
//}

///*
// * Is the high resolution mode active ?
// */
//static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *cpu_base)
//{
//	return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ?
//		cpu_base->hres_active : 0;
//}

//static inline int hrtimer_hres_active(void)
//{
//	return __hrtimer_hres_active(this_cpu_ptr(&hrtimer_bases));
//}

///*
// * Reprogram the event source with checking both queues for the
// * next event
// * Called with interrupts disabled and base->lock held
// */
//static void
//hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base, int skip_equal)
//{
//	ktime_t expires_next;

//	expires_next = hrtimer_update_next_event(cpu_base);

//	if (skip_equal && expires_next == cpu_base->expires_next)
//		return;

//	cpu_base->expires_next = expires_next;

//	/*
//	 * If hres is not active, hardware does not have to be
//	 * reprogrammed yet.
//	 *
//	 * If a hang was detected in the last timer interrupt then we
//	 * leave the hang delay active in the hardware. We want the
//	 * system to make progress. That also prevents the following
//	 * scenario:
//	 * T1 expires 50ms from now
//	 * T2 expires 5s from now
//	 *
//	 * T1 is removed, so this code is called and would reprogram
//	 * the hardware to 5s from now. Any hrtimer_start after that
//	 * will not reprogram the hardware due to hang_detected being
//	 * set. So we'd effectivly block all timers until the T2 event
//	 * fires.
//	 */
//	if (!__hrtimer_hres_active(cpu_base) || cpu_base->hang_detected)
//		return;

//	tick_program_event(cpu_base->expires_next, 1);
//}

///* High resolution timer related functions */
//#ifdef CONFIG_HIGH_RES_TIMERS

///*
// * High resolution timer enabled ?
// */
//static bool hrtimer_hres_enabled __read_mostly  = true;
//unsigned int hrtimer_resolution __read_mostly = LOW_RES_NSEC;
//EXPORT_SYMBOL_GPL(hrtimer_resolution);

///*
// * Enable / Disable high resolution mode
// */
//static int __init setup_hrtimer_hres(char *str)
//{
//	return (kstrtobool(str, &hrtimer_hres_enabled) == 0);
//}

//__setup("highres=", setup_hrtimer_hres);

///*
// * hrtimer_high_res_enabled - query, if the highres mode is enabled
// */
//static inline int hrtimer_is_hres_enabled(void)
//{
//	return hrtimer_hres_enabled;
//}

///*
// * Retrigger next event is called after clock was set
// *
// * Called with interrupts disabled via on_each_cpu()
// */
//static void retrigger_next_event(void *arg)
//{
//	struct hrtimer_cpu_base *base = this_cpu_ptr(&hrtimer_bases);

//	if (!__hrtimer_hres_active(base))
//		return;

//	raw_spin_lock(&base->lock);
//	hrtimer_update_base(base);
//	hrtimer_force_reprogram(base, 0);
//	raw_spin_unlock(&base->lock);
//}

///*
// * Switch to high resolution mode
// */
//static void hrtimer_switch_to_hres(void)
//{
//	struct hrtimer_cpu_base *base = this_cpu_ptr(&hrtimer_bases);

//	if (tick_init_highres()) {
//		pr_warn("Could not switch to high resolution mode on CPU %u\n",
//			base->cpu);
//		return;
//	}
//	base->hres_active = 1;
//	hrtimer_resolution = HIGH_RES_NSEC;

//	tick_setup_sched_timer();
//	/* "Retrigger" the interrupt to get things going */
//	retrigger_next_event(NULL);
//}

//static void clock_was_set_work(struct work_struct *work)
//{
//	clock_was_set();
//}

//static DECLARE_WORK(hrtimer_work, clock_was_set_work);

///*
// * Called from timekeeping and resume code to reprogram the hrtimer
// * interrupt device on all cpus.
// */
//void clock_was_set_delayed(void)
//{
//	schedule_work(&hrtimer_work);
//}

//#else

//static inline int hrtimer_is_hres_enabled(void) { return 0; }
//static inline void hrtimer_switch_to_hres(void) { }
//static inline void retrigger_next_event(void *arg) { }

//#endif /* CONFIG_HIGH_RES_TIMERS */

///*
// * When a timer is enqueued and expires earlier than the already enqueued
// * timers, we have to check, whether it expires earlier than the timer for
// * which the clock event device was armed.
// *
// * Called with interrupts disabled and base->cpu_base.lock held
// */
//static void hrtimer_reprogram(struct hrtimer *timer, bool reprogram)
//{
//	struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
//	struct hrtimer_clock_base *base = timer->base;
//	ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset);

//	WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0);

//	/*
//	 * CLOCK_REALTIME timer might be requested with an absolute
//	 * expiry time which is less than base->offset. Set it to 0.
//	 */
//	if (expires < 0)
//		expires = 0;

//	if (timer->is_soft) {
//		/*
//		 * soft hrtimer could be started on a remote CPU. In this
//		 * case softirq_expires_next needs to be updated on the
//		 * remote CPU. The soft hrtimer will not expire before the
//		 * first hard hrtimer on the remote CPU -
//		 * hrtimer_check_target() prevents this case.
//		 */
//		struct hrtimer_cpu_base *timer_cpu_base = base->cpu_base;

//		if (timer_cpu_base->softirq_activated)
//			return;

//		if (!ktime_before(expires, timer_cpu_base->softirq_expires_next))
//			return;

//		timer_cpu_base->softirq_next_timer = timer;
//		timer_cpu_base->softirq_expires_next = expires;

//		if (!ktime_before(expires, timer_cpu_base->expires_next) ||
//		    !reprogram)
//			return;
//	}

//	/*
//	 * If the timer is not on the current cpu, we cannot reprogram
//	 * the other cpus clock event device.
//	 */
//	if (base->cpu_base != cpu_base)
//		return;

//	/*
//	 * If the hrtimer interrupt is running, then it will
//	 * reevaluate the clock bases and reprogram the clock event
//	 * device. The callbacks are always executed in hard interrupt
//	 * context so we don't need an extra check for a running
//	 * callback.
//	 */
//	if (cpu_base->in_hrtirq)
//		return;

//	if (expires >= cpu_base->expires_next)
//		return;

//	/* Update the pointer to the next expiring timer */
//	cpu_base->next_timer = timer;
//	cpu_base->expires_next = expires;

//	/*
//	 * If hres is not active, hardware does not have to be
//	 * programmed yet.
//	 *
//	 * If a hang was detected in the last timer interrupt then we
//	 * do not schedule a timer which is earlier than the expiry
//	 * which we enforced in the hang detection. We want the system
//	 * to make progress.
//	 */
//	if (!__hrtimer_hres_active(cpu_base) || cpu_base->hang_detected)
//		return;

//	/*
//	 * Program the timer hardware. We enforce the expiry for
//	 * events which are already in the past.
//	 */
//	tick_program_event(expires, 1);
//}

/*
 * Clock realtime was set
 *
 * Change the offset of the realtime clock vs. the monotonic
 * clock.
 *
 * We might have to reprogram the high resolution timer interrupt. On
 * SMP we call the architecture specific code to retrigger _all_ high
 * resolution timer interrupts. On UP we just disable interrupts and
 * call the high resolution interrupt code.
 */
void clock_was_set(void)
{
//#ifdef CONFIG_HIGH_RES_TIMERS
//	/* Retrigger the CPU local events everywhere */
//	on_each_cpu(retrigger_next_event, NULL, 1);
//#endif
//	timerfd_clock_was_set();
}

///*
// * During resume we might have to reprogram the high resolution timer
// * interrupt on all online CPUs.  However, all other CPUs will be
// * stopped with IRQs interrupts disabled so the clock_was_set() call
// * must be deferred.
// */
//void hrtimers_resume(void)
//{
//	lockdep_assert_irqs_disabled();
//	/* Retrigger on the local CPU */
//	retrigger_next_event(NULL);
//	/* And schedule a retrigger for all others */
//	clock_was_set_delayed();
//}

///*
// * Counterpart to lock_hrtimer_base above:
// */
//static inline
//void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
//{
//	raw_spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags);
//}

///**
// * hrtimer_forward - forward the timer expiry
// * @timer:	hrtimer to forward
// * @now:	forward past this time
// * @interval:	the interval to forward
// *
// * Forward the timer expiry so it will expire in the future.
// * Returns the number of overruns.
// *
// * Can be safely called from the callback function of @timer. If
// * called from other contexts @timer must neither be enqueued nor
// * running the callback and the caller needs to take care of
// * serialization.
// *
// * Note: This only updates the timer expiry value and does not requeue
// * the timer.
// */
//u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
//{
//	u64 orun = 1;
//	ktime_t delta;

//	delta = ktime_sub(now, hrtimer_get_expires(timer));

//	if (delta < 0)
//		return 0;

//	if (WARN_ON(timer->state & HRTIMER_STATE_ENQUEUED))
//		return 0;

//	if (interval < hrtimer_resolution)
//		interval = hrtimer_resolution;

//	if (unlikely(delta >= interval)) {
//		s64 incr = ktime_to_ns(interval);

//		orun = ktime_divns(delta, incr);
//		hrtimer_add_expires_ns(timer, incr * orun);
//		if (hrtimer_get_expires_tv64(timer) > now)
//			return orun;
//		/*
//		 * This (and the ktime_add() below) is the
//		 * correction for exact:
//		 */
//		orun++;
//	}
//	hrtimer_add_expires(timer, interval);

//	return orun;
//}
//EXPORT_SYMBOL_GPL(hrtimer_forward);

///*
// * enqueue_hrtimer - internal function to (re)start a timer
// *
// * The timer is inserted in expiry order. Insertion into the
// * red black tree is O(log(n)). Must hold the base lock.
// *
// * Returns 1 when the new timer is the leftmost timer in the tree.
// */
//static int enqueue_hrtimer(struct hrtimer *timer,
//			   struct hrtimer_clock_base *base,
//			   enum hrtimer_mode mode)
//{
//	debug_activate(timer, mode);

//	base->cpu_base->active_bases |= 1 << base->index;

//	/* Pairs with the lockless read in hrtimer_is_queued() */
//	WRITE_ONCE(timer->state, HRTIMER_STATE_ENQUEUED);

//	return timerqueue_add(&base->active, &timer->node);
//}

///*
// * __remove_hrtimer - internal function to remove a timer
// *
// * Caller must hold the base lock.
// *
// * High resolution timer mode reprograms the clock event device when the
// * timer is the one which expires next. The caller can disable this by setting
// * reprogram to zero. This is useful, when the context does a reprogramming
// * anyway (e.g. timer interrupt)
// */
//static void __remove_hrtimer(struct hrtimer *timer,
//			     struct hrtimer_clock_base *base,
//			     u8 newstate, int reprogram)
//{
//	struct hrtimer_cpu_base *cpu_base = base->cpu_base;
//	u8 state = timer->state;

//	/* Pairs with the lockless read in hrtimer_is_queued() */
//	WRITE_ONCE(timer->state, newstate);
//	if (!(state & HRTIMER_STATE_ENQUEUED))
//		return;

//	if (!timerqueue_del(&base->active, &timer->node))
//		cpu_base->active_bases &= ~(1 << base->index);

//	/*
//	 * Note: If reprogram is false we do not update
//	 * cpu_base->next_timer. This happens when we remove the first
//	 * timer on a remote cpu. No harm as we never dereference
//	 * cpu_base->next_timer. So the worst thing what can happen is
//	 * an superflous call to hrtimer_force_reprogram() on the
//	 * remote cpu later on if the same timer gets enqueued again.
//	 */
//	if (reprogram && timer == cpu_base->next_timer)
//		hrtimer_force_reprogram(cpu_base, 1);
//}

///*
// * remove hrtimer, called with base lock held
// */
//static inline int
//remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base, bool restart)
//{
//	u8 state = timer->state;

//	if (state & HRTIMER_STATE_ENQUEUED) {
//		int reprogram;

//		/*
//		 * Remove the timer and force reprogramming when high
//		 * resolution mode is active and the timer is on the current
//		 * CPU. If we remove a timer on another CPU, reprogramming is
//		 * skipped. The interrupt event on this CPU is fired and
//		 * reprogramming happens in the interrupt handler. This is a
//		 * rare case and less expensive than a smp call.
//		 */
//		debug_deactivate(timer);
//		reprogram = base->cpu_base == this_cpu_ptr(&hrtimer_bases);

//		if (!restart)
//			state = HRTIMER_STATE_INACTIVE;

//		__remove_hrtimer(timer, base, state, reprogram);
//		return 1;
//	}
//	return 0;
//}

//static inline ktime_t hrtimer_update_lowres(struct hrtimer *timer, ktime_t tim,
//					    const enum hrtimer_mode mode)
//{
//#ifdef CONFIG_TIME_LOW_RES
//	/*
//	 * CONFIG_TIME_LOW_RES indicates that the system has no way to return
//	 * granular time values. For relative timers we add hrtimer_resolution
//	 * (i.e. one jiffie) to prevent short timeouts.
//	 */
//	timer->is_rel = mode & HRTIMER_MODE_REL;
//	if (timer->is_rel)
//		tim = ktime_add_safe(tim, hrtimer_resolution);
//#endif
//	return tim;
//}

//static void
//hrtimer_update_softirq_timer(struct hrtimer_cpu_base *cpu_base, bool reprogram)
//{
//	ktime_t expires;

//	/*
//	 * Find the next SOFT expiration.
//	 */
//	expires = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_SOFT);

//	/*
//	 * reprogramming needs to be triggered, even if the next soft
//	 * hrtimer expires at the same time than the next hard
//	 * hrtimer. cpu_base->softirq_expires_next needs to be updated!
//	 */
//	if (expires == KTIME_MAX)
//		return;

//	/*
//	 * cpu_base->*next_timer is recomputed by __hrtimer_get_next_event()
//	 * cpu_base->*expires_next is only set by hrtimer_reprogram()
//	 */
//	hrtimer_reprogram(cpu_base->softirq_next_timer, reprogram);
//}

//static int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
//				    u64 delta_ns, const enum hrtimer_mode mode,
//				    struct hrtimer_clock_base *base)
//{
//	struct hrtimer_clock_base *new_base;

//	/* Remove an active timer from the queue: */
//	remove_hrtimer(timer, base, true);

//	if (mode & HRTIMER_MODE_REL)
//		tim = ktime_add_safe(tim, base->get_time());

//	tim = hrtimer_update_lowres(timer, tim, mode);

//	hrtimer_set_expires_range_ns(timer, tim, delta_ns);

//	/* Switch the timer base, if necessary: */
//	new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);

//	return enqueue_hrtimer(timer, new_base, mode);
//}

///**
// * hrtimer_start_range_ns - (re)start an hrtimer
// * @timer:	the timer to be added
// * @tim:	expiry time
// * @delta_ns:	"slack" range for the timer
// * @mode:	timer mode: absolute (HRTIMER_MODE_ABS) or
// *		relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED);
// *		softirq based mode is considered for debug purpose only!
// */
//void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
//			    u64 delta_ns, const enum hrtimer_mode mode)
//{
//	struct hrtimer_clock_base *base;
//	unsigned long flags;

//	/*
//	 * Check whether the HRTIMER_MODE_SOFT bit and hrtimer.is_soft
//	 * match on CONFIG_PREEMPT_RT = n. With PREEMPT_RT check the hard
//	 * expiry mode because unmarked timers are moved to softirq expiry.
//	 */
//	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
//		WARN_ON_ONCE(!(mode & HRTIMER_MODE_SOFT) ^ !timer->is_soft);
//	else
//		WARN_ON_ONCE(!(mode & HRTIMER_MODE_HARD) ^ !timer->is_hard);

//	base = lock_hrtimer_base(timer, &flags);

//	if (__hrtimer_start_range_ns(timer, tim, delta_ns, mode, base))
//		hrtimer_reprogram(timer, true);

//	unlock_hrtimer_base(timer, &flags);
//}
//EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);

///**
// * hrtimer_try_to_cancel - try to deactivate a timer
// * @timer:	hrtimer to stop
// *
// * Returns:
// *
// *  *  0 when the timer was not active
// *  *  1 when the timer was active
// *  * -1 when the timer is currently executing the callback function and
// *    cannot be stopped
// */
//int hrtimer_try_to_cancel(struct hrtimer *timer)
//{
//	struct hrtimer_clock_base *base;
//	unsigned long flags;
//	int ret = -1;

//	/*
//	 * Check lockless first. If the timer is not active (neither
//	 * enqueued nor running the callback, nothing to do here.  The
//	 * base lock does not serialize against a concurrent enqueue,
//	 * so we can avoid taking it.
//	 */
//	if (!hrtimer_active(timer))
//		return 0;

//	base = lock_hrtimer_base(timer, &flags);

//	if (!hrtimer_callback_running(timer))
//		ret = remove_hrtimer(timer, base, false);

//	unlock_hrtimer_base(timer, &flags);

//	return ret;

//}
//EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel);

//#ifdef CONFIG_PREEMPT_RT
//static void hrtimer_cpu_base_init_expiry_lock(struct hrtimer_cpu_base *base)
//{
//	spin_lock_init(&base->softirq_expiry_lock);
//}

//static void hrtimer_cpu_base_lock_expiry(struct hrtimer_cpu_base *base)
//{
//	spin_lock(&base->softirq_expiry_lock);
//}

//static void hrtimer_cpu_base_unlock_expiry(struct hrtimer_cpu_base *base)
//{
//	spin_unlock(&base->softirq_expiry_lock);
//}

///*
// * The counterpart to hrtimer_cancel_wait_running().
// *
// * If there is a waiter for cpu_base->expiry_lock, then it was waiting for
// * the timer callback to finish. Drop expiry_lock and reaquire it. That
// * allows the waiter to acquire the lock and make progress.
// */
//static void hrtimer_sync_wait_running(struct hrtimer_cpu_base *cpu_base,
//				      unsigned long flags)
//{
//	if (atomic_read(&cpu_base->timer_waiters)) {
//		raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
//		spin_unlock(&cpu_base->softirq_expiry_lock);
//		spin_lock(&cpu_base->softirq_expiry_lock);
//		raw_spin_lock_irq(&cpu_base->lock);
//	}
//}

///*
// * This function is called on PREEMPT_RT kernels when the fast path
// * deletion of a timer failed because the timer callback function was
// * running.
// *
// * This prevents priority inversion: if the soft irq thread is preempted
// * in the middle of a timer callback, then calling del_timer_sync() can
// * lead to two issues:
// *
// *  - If the caller is on a remote CPU then it has to spin wait for the timer
// *    handler to complete. This can result in unbound priority inversion.
// *
// *  - If the caller originates from the task which preempted the timer
// *    handler on the same CPU, then spin waiting for the timer handler to
// *    complete is never going to end.
// */
//void hrtimer_cancel_wait_running(const struct hrtimer *timer)
//{
//	/* Lockless read. Prevent the compiler from reloading it below */
//	struct hrtimer_clock_base *base = READ_ONCE(timer->base);

//	/*
//	 * Just relax if the timer expires in hard interrupt context or if
//	 * it is currently on the migration base.
//	 */
//	if (!timer->is_soft || is_migration_base(base)) {
//		cpu_relax();
//		return;
//	}

//	/*
//	 * Mark the base as contended and grab the expiry lock, which is
//	 * held by the softirq across the timer callback. Drop the lock
//	 * immediately so the softirq can expire the next timer. In theory
//	 * the timer could already be running again, but that's more than
//	 * unlikely and just causes another wait loop.
//	 */
//	atomic_inc(&base->cpu_base->timer_waiters);
//	spin_lock_bh(&base->cpu_base->softirq_expiry_lock);
//	atomic_dec(&base->cpu_base->timer_waiters);
//	spin_unlock_bh(&base->cpu_base->softirq_expiry_lock);
//}
//#else
//static inline void
//hrtimer_cpu_base_init_expiry_lock(struct hrtimer_cpu_base *base) { }
//static inline void
//hrtimer_cpu_base_lock_expiry(struct hrtimer_cpu_base *base) { }
//static inline void
//hrtimer_cpu_base_unlock_expiry(struct hrtimer_cpu_base *base) { }
//static inline void hrtimer_sync_wait_running(struct hrtimer_cpu_base *base,
//					     unsigned long flags) { }
//#endif

///**
// * hrtimer_cancel - cancel a timer and wait for the handler to finish.
// * @timer:	the timer to be cancelled
// *
// * Returns:
// *  0 when the timer was not active
// *  1 when the timer was active
// */
//int hrtimer_cancel(struct hrtimer *timer)
//{
//	int ret;

//	do {
//		ret = hrtimer_try_to_cancel(timer);

//		if (ret < 0)
//			hrtimer_cancel_wait_running(timer);
//	} while (ret < 0);
//	return ret;
//}
//EXPORT_SYMBOL_GPL(hrtimer_cancel);

///**
// * hrtimer_get_remaining - get remaining time for the timer
// * @timer:	the timer to read
// * @adjust:	adjust relative timers when CONFIG_TIME_LOW_RES=y
// */
//ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust)
//{
//	unsigned long flags;
//	ktime_t rem;

//	lock_hrtimer_base(timer, &flags);
//	if (IS_ENABLED(CONFIG_TIME_LOW_RES) && adjust)
//		rem = hrtimer_expires_remaining_adjusted(timer);
//	else
//		rem = hrtimer_expires_remaining(timer);
//	unlock_hrtimer_base(timer, &flags);

//	return rem;
//}
//EXPORT_SYMBOL_GPL(__hrtimer_get_remaining);

//#ifdef CONFIG_NO_HZ_COMMON
///**
// * hrtimer_get_next_event - get the time until next expiry event
// *
// * Returns the next expiry time or KTIME_MAX if no timer is pending.
// */
//u64 hrtimer_get_next_event(void)
//{
//	struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
//	u64 expires = KTIME_MAX;
//	unsigned long flags;

//	raw_spin_lock_irqsave(&cpu_base->lock, flags);

//	if (!__hrtimer_hres_active(cpu_base))
//		expires = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_ALL);

//	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);

//	return expires;
//}

///**
// * hrtimer_next_event_without - time until next expiry event w/o one timer
// * @exclude:	timer to exclude
// *
// * Returns the next expiry time over all timers except for the @exclude one or
// * KTIME_MAX if none of them is pending.
// */
//u64 hrtimer_next_event_without(const struct hrtimer *exclude)
//{
//	struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
//	u64 expires = KTIME_MAX;
//	unsigned long flags;

//	raw_spin_lock_irqsave(&cpu_base->lock, flags);

//	if (__hrtimer_hres_active(cpu_base)) {
//		unsigned int active;

//		if (!cpu_base->softirq_activated) {
//			active = cpu_base->active_bases & HRTIMER_ACTIVE_SOFT;
//			expires = __hrtimer_next_event_base(cpu_base, exclude,
//							    active, KTIME_MAX);
//		}
//		active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD;
//		expires = __hrtimer_next_event_base(cpu_base, exclude, active,
//						    expires);
//	}

//	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);

//	return expires;
//}
//#endif

//static inline int hrtimer_clockid_to_base(clockid_t clock_id)
//{
//	if (likely(clock_id < MAX_CLOCKS)) {
//		int base = hrtimer_clock_to_base_table[clock_id];

//		if (likely(base != HRTIMER_MAX_CLOCK_BASES))
//			return base;
//	}
//	WARN(1, "Invalid clockid %d. Using MONOTONIC\n", clock_id);
//	return HRTIMER_BASE_MONOTONIC;
//}

//static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
//			   enum hrtimer_mode mode)
//{
//	bool softtimer = !!(mode & HRTIMER_MODE_SOFT);
//	struct hrtimer_cpu_base *cpu_base;
//	int base;

//	/*
//	 * On PREEMPT_RT enabled kernels hrtimers which are not explicitely
//	 * marked for hard interrupt expiry mode are moved into soft
//	 * interrupt context for latency reasons and because the callbacks
//	 * can invoke functions which might sleep on RT, e.g. spin_lock().
//	 */
//	if (IS_ENABLED(CONFIG_PREEMPT_RT) && !(mode & HRTIMER_MODE_HARD))
//		softtimer = true;

//	memset(timer, 0, sizeof(struct hrtimer));

//	cpu_base = raw_cpu_ptr(&hrtimer_bases);

//	/*
//	 * POSIX magic: Relative CLOCK_REALTIME timers are not affected by
//	 * clock modifications, so they needs to become CLOCK_MONOTONIC to
//	 * ensure POSIX compliance.
//	 */
//	if (clock_id == CLOCK_REALTIME && mode & HRTIMER_MODE_REL)
//		clock_id = CLOCK_MONOTONIC;

//	base = softtimer ? HRTIMER_MAX_CLOCK_BASES / 2 : 0;
//	base += hrtimer_clockid_to_base(clock_id);
//	timer->is_soft = softtimer;
//	timer->is_hard = !!(mode & HRTIMER_MODE_HARD);
//	timer->base = &cpu_base->clock_base[base];
//	timerqueue_init(&timer->node);
//}

///**
// * hrtimer_init - initialize a timer to the given clock
// * @timer:	the timer to be initialized
// * @clock_id:	the clock to be used
// * @mode:       The modes which are relevant for intitialization:
// *              HRTIMER_MODE_ABS, HRTIMER_MODE_REL, HRTIMER_MODE_ABS_SOFT,
// *              HRTIMER_MODE_REL_SOFT
// *
// *              The PINNED variants of the above can be handed in,
// *              but the PINNED bit is ignored as pinning happens
// *              when the hrtimer is started
// */
//void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
//		  enum hrtimer_mode mode)
//{
//	debug_init(timer, clock_id, mode);
//	__hrtimer_init(timer, clock_id, mode);
//}
//EXPORT_SYMBOL_GPL(hrtimer_init);

///*
// * A timer is active, when it is enqueued into the rbtree or the
// * callback function is running or it's in the state of being migrated
// * to another cpu.
// *
// * It is important for this function to not return a false negative.
// */
//bool hrtimer_active(const struct hrtimer *timer)
//{
//	struct hrtimer_clock_base *base;
//	unsigned int seq;

//	do {
//		base = READ_ONCE(timer->base);
//		seq = raw_read_seqcount_begin(&base->seq);

//		if (timer->state != HRTIMER_STATE_INACTIVE ||
//		    base->running == timer)
//			return true;

//	} while (read_seqcount_retry(&base->seq, seq) ||
//		 base != READ_ONCE(timer->base));

//	return false;
//}
//EXPORT_SYMBOL_GPL(hrtimer_active);

///*
// * The write_seqcount_barrier()s in __run_hrtimer() split the thing into 3
// * distinct sections:
// *
// *  - queued:	the timer is queued
// *  - callback:	the timer is being ran
// *  - post:	the timer is inactive or (re)queued
// *
// * On the read side we ensure we observe timer->state and cpu_base->running
// * from the same section, if anything changed while we looked at it, we retry.
// * This includes timer->base changing because sequence numbers alone are
// * insufficient for that.
// *
// * The sequence numbers are required because otherwise we could still observe
// * a false negative if the read side got smeared over multiple consequtive
// * __run_hrtimer() invocations.
// */

//static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
//			  struct hrtimer_clock_base *base,
//			  struct hrtimer *timer, ktime_t *now,
//			  unsigned long flags) __must_hold(&cpu_base->lock)
//{
//	enum hrtimer_restart (*fn)(struct hrtimer *);
//	bool expires_in_hardirq;
//	int restart;

//	lockdep_assert_held(&cpu_base->lock);

//	debug_deactivate(timer);
//	base->running = timer;

//	/*
//	 * Separate the ->running assignment from the ->state assignment.
//	 *
//	 * As with a regular write barrier, this ensures the read side in
//	 * hrtimer_active() cannot observe base->running == NULL &&
//	 * timer->state == INACTIVE.
//	 */
//	raw_write_seqcount_barrier(&base->seq);

//	__remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, 0);
//	fn = timer->function;

//	/*
//	 * Clear the 'is relative' flag for the TIME_LOW_RES case. If the
//	 * timer is restarted with a period then it becomes an absolute
//	 * timer. If its not restarted it does not matter.
//	 */
//	if (IS_ENABLED(CONFIG_TIME_LOW_RES))
//		timer->is_rel = false;

//	/*
//	 * The timer is marked as running in the CPU base, so it is
//	 * protected against migration to a different CPU even if the lock
//	 * is dropped.
//	 */
//	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
//	trace_hrtimer_expire_entry(timer, now);
//	expires_in_hardirq = lockdep_hrtimer_enter(timer);

//	restart = fn(timer);

//	lockdep_hrtimer_exit(expires_in_hardirq);
//	trace_hrtimer_expire_exit(timer);
//	raw_spin_lock_irq(&cpu_base->lock);

//	/*
//	 * Note: We clear the running state after enqueue_hrtimer and
//	 * we do not reprogram the event hardware. Happens either in
//	 * hrtimer_start_range_ns() or in hrtimer_interrupt()
//	 *
//	 * Note: Because we dropped the cpu_base->lock above,
//	 * hrtimer_start_range_ns() can have popped in and enqueued the timer
//	 * for us already.
//	 */
//	if (restart != HRTIMER_NORESTART &&
//	    !(timer->state & HRTIMER_STATE_ENQUEUED))
//		enqueue_hrtimer(timer, base, HRTIMER_MODE_ABS);

//	/*
//	 * Separate the ->running assignment from the ->state assignment.
//	 *
//	 * As with a regular write barrier, this ensures the read side in
//	 * hrtimer_active() cannot observe base->running.timer == NULL &&
//	 * timer->state == INACTIVE.
//	 */
//	raw_write_seqcount_barrier(&base->seq);

//	WARN_ON_ONCE(base->running != timer);
//	base->running = NULL;
//}

//static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now,
//				 unsigned long flags, unsigned int active_mask)
//{
//	struct hrtimer_clock_base *base;
//	unsigned int active = cpu_base->active_bases & active_mask;

//	for_each_active_base(base, cpu_base, active) {
//		struct timerqueue_node *node;
//		ktime_t basenow;

//		basenow = ktime_add(now, base->offset);

//		while ((node = timerqueue_getnext(&base->active))) {
//			struct hrtimer *timer;

//			timer = container_of(node, struct hrtimer, node);

//			/*
//			 * The immediate goal for using the softexpires is
//			 * minimizing wakeups, not running timers at the
//			 * earliest interrupt after their soft expiration.
//			 * This allows us to avoid using a Priority Search
//			 * Tree, which can answer a stabbing querry for
//			 * overlapping intervals and instead use the simple
//			 * BST we already have.
//			 * We don't add extra wakeups by delaying timers that
//			 * are right-of a not yet expired timer, because that
//			 * timer will have to trigger a wakeup anyway.
//			 */
//			if (basenow < hrtimer_get_softexpires_tv64(timer))
//				break;

//			__run_hrtimer(cpu_base, base, timer, &basenow, flags);
//			if (active_mask == HRTIMER_ACTIVE_SOFT)
//				hrtimer_sync_wait_running(cpu_base, flags);
//		}
//	}
//}

//static __latent_entropy void hrtimer_run_softirq(struct softirq_action *h)
//{
//	struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
//	unsigned long flags;
//	ktime_t now;

//	hrtimer_cpu_base_lock_expiry(cpu_base);
//	raw_spin_lock_irqsave(&cpu_base->lock, flags);

//	now = hrtimer_update_base(cpu_base);
//	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_SOFT);

//	cpu_base->softirq_activated = 0;
//	hrtimer_update_softirq_timer(cpu_base, true);

//	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
//	hrtimer_cpu_base_unlock_expiry(cpu_base);
//}

//#ifdef CONFIG_HIGH_RES_TIMERS

///*
// * High resolution timer interrupt
// * Called with interrupts disabled
// */
//void hrtimer_interrupt(struct clock_event_device *dev)
//{
//	struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
//	ktime_t expires_next, now, entry_time, delta;
//	unsigned long flags;
//	int retries = 0;

//	BUG_ON(!cpu_base->hres_active);
//	cpu_base->nr_events++;
//	dev->next_event = KTIME_MAX;

//	raw_spin_lock_irqsave(&cpu_base->lock, flags);
//	entry_time = now = hrtimer_update_base(cpu_base);
//retry:
//	cpu_base->in_hrtirq = 1;
//	/*
//	 * We set expires_next to KTIME_MAX here with cpu_base->lock
//	 * held to prevent that a timer is enqueued in our queue via
//	 * the migration code. This does not affect enqueueing of
//	 * timers which run their callback and need to be requeued on
//	 * this CPU.
//	 */
//	cpu_base->expires_next = KTIME_MAX;

//	if (!ktime_before(now, cpu_base->softirq_expires_next)) {
//		cpu_base->softirq_expires_next = KTIME_MAX;
//		cpu_base->softirq_activated = 1;
//		raise_softirq_irqoff(HRTIMER_SOFTIRQ);
//	}

//	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD);

//	/* Reevaluate the clock bases for the [soft] next expiry */
//	expires_next = hrtimer_update_next_event(cpu_base);
//	/*
//	 * Store the new expiry value so the migration code can verify
//	 * against it.
//	 */
//	cpu_base->expires_next = expires_next;
//	cpu_base->in_hrtirq = 0;
//	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);

//	/* Reprogramming necessary ? */
//	if (!tick_program_event(expires_next, 0)) {
//		cpu_base->hang_detected = 0;
//		return;
//	}

//	/*
//	 * The next timer was already expired due to:
//	 * - tracing
//	 * - long lasting callbacks
//	 * - being scheduled away when running in a VM
//	 *
//	 * We need to prevent that we loop forever in the hrtimer
//	 * interrupt routine. We give it 3 attempts to avoid
//	 * overreacting on some spurious event.
//	 *
//	 * Acquire base lock for updating the offsets and retrieving
//	 * the current time.
//	 */
//	raw_spin_lock_irqsave(&cpu_base->lock, flags);
//	now = hrtimer_update_base(cpu_base);
//	cpu_base->nr_retries++;
//	if (++retries < 3)
//		goto retry;
//	/*
//	 * Give the system a chance to do something else than looping
//	 * here. We stored the entry time, so we know exactly how long
//	 * we spent here. We schedule the next event this amount of
//	 * time away.
//	 */
//	cpu_base->nr_hangs++;
//	cpu_base->hang_detected = 1;
//	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);

//	delta = ktime_sub(now, entry_time);
//	if ((unsigned int)delta > cpu_base->max_hang_time)
//		cpu_base->max_hang_time = (unsigned int) delta;
//	/*
//	 * Limit it to a sensible value as we enforce a longer
//	 * delay. Give the CPU at least 100ms to catch up.
//	 */
//	if (delta > 100 * NSEC_PER_MSEC)
//		expires_next = ktime_add_ns(now, 100 * NSEC_PER_MSEC);
//	else
//		expires_next = ktime_add(now, delta);
//	tick_program_event(expires_next, 1);
//	pr_warn_once("hrtimer: interrupt took %llu ns\n", ktime_to_ns(delta));
//}

///* called with interrupts disabled */
//static inline void __hrtimer_peek_ahead_timers(void)
//{
//	struct tick_device *td;

//	if (!hrtimer_hres_active())
//		return;

//	td = this_cpu_ptr(&tick_cpu_device);
//	if (td && td->evtdev)
//		hrtimer_interrupt(td->evtdev);
//}

//#else /* CONFIG_HIGH_RES_TIMERS */

//static inline void __hrtimer_peek_ahead_timers(void) { }

//#endif	/* !CONFIG_HIGH_RES_TIMERS */

///*
// * Called from run_local_timers in hardirq context every jiffy
// */
//void hrtimer_run_queues(void)
//{
//	struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
//	unsigned long flags;
//	ktime_t now;

//	if (__hrtimer_hres_active(cpu_base))
//		return;

//	/*
//	 * This _is_ ugly: We have to check periodically, whether we
//	 * can switch to highres and / or nohz mode. The clocksource
//	 * switch happens with xtime_lock held. Notification from
//	 * there only sets the check bit in the tick_oneshot code,
//	 * otherwise we might deadlock vs. xtime_lock.
//	 */
//	if (tick_check_oneshot_change(!hrtimer_is_hres_enabled())) {
//		hrtimer_switch_to_hres();
//		return;
//	}

//	raw_spin_lock_irqsave(&cpu_base->lock, flags);
//	now = hrtimer_update_base(cpu_base);

//	if (!ktime_before(now, cpu_base->softirq_expires_next)) {
//		cpu_base->softirq_expires_next = KTIME_MAX;
//		cpu_base->softirq_activated = 1;
//		raise_softirq_irqoff(HRTIMER_SOFTIRQ);
//	}

//	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD);
//	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
//}

///*
// * Sleep related functions:
// */
//static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
//{
//	struct hrtimer_sleeper *t =
//		container_of(timer, struct hrtimer_sleeper, timer);
//	struct task_struct *task = t->task;

//	t->task = NULL;
//	if (task)
//		wake_up_process(task);

//	return HRTIMER_NORESTART;
//}

///**
// * hrtimer_sleeper_start_expires - Start a hrtimer sleeper timer
// * @sl:		sleeper to be started
// * @mode:	timer mode abs/rel
// *
// * Wrapper around hrtimer_start_expires() for hrtimer_sleeper based timers
// * to allow PREEMPT_RT to tweak the delivery mode (soft/hardirq context)
// */
//void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl,
//				   enum hrtimer_mode mode)
//{
//	/*
//	 * Make the enqueue delivery mode check work on RT. If the sleeper
//	 * was initialized for hard interrupt delivery, force the mode bit.
//	 * This is a special case for hrtimer_sleepers because
//	 * hrtimer_init_sleeper() determines the delivery mode on RT so the
//	 * fiddling with this decision is avoided at the call sites.
//	 */
//	if (IS_ENABLED(CONFIG_PREEMPT_RT) && sl->timer.is_hard)
//		mode |= HRTIMER_MODE_HARD;

//	hrtimer_start_expires(&sl->timer, mode);
//}
//EXPORT_SYMBOL_GPL(hrtimer_sleeper_start_expires);

//static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
//				   clockid_t clock_id, enum hrtimer_mode mode)
//{
//	/*
//	 * On PREEMPT_RT enabled kernels hrtimers which are not explicitely
//	 * marked for hard interrupt expiry mode are moved into soft
//	 * interrupt context either for latency reasons or because the
//	 * hrtimer callback takes regular spinlocks or invokes other
//	 * functions which are not suitable for hard interrupt context on
//	 * PREEMPT_RT.
//	 *
//	 * The hrtimer_sleeper callback is RT compatible in hard interrupt
//	 * context, but there is a latency concern: Untrusted userspace can
//	 * spawn many threads which arm timers for the same expiry time on
//	 * the same CPU. That causes a latency spike due to the wakeup of
//	 * a gazillion threads.
//	 *
//	 * OTOH, priviledged real-time user space applications rely on the
//	 * low latency of hard interrupt wakeups. If the current task is in
//	 * a real-time scheduling class, mark the mode for hard interrupt
//	 * expiry.
//	 */
//	if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
//		if (task_is_realtime(current) && !(mode & HRTIMER_MODE_SOFT))
//			mode |= HRTIMER_MODE_HARD;
//	}

//	__hrtimer_init(&sl->timer, clock_id, mode);
//	sl->timer.function = hrtimer_wakeup;
//	sl->task = current;
//}

///**
// * hrtimer_init_sleeper - initialize sleeper to the given clock
// * @sl:		sleeper to be initialized
// * @clock_id:	the clock to be used
// * @mode:	timer mode abs/rel
// */
//void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id,
//			  enum hrtimer_mode mode)
//{
//	debug_init(&sl->timer, clock_id, mode);
//	__hrtimer_init_sleeper(sl, clock_id, mode);

//}
//EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);

//int nanosleep_copyout(struct restart_block *restart, struct timespec64 *ts)
//{
//	switch(restart->nanosleep.type) {
//#ifdef CONFIG_COMPAT_32BIT_TIME
//	case TT_COMPAT:
//		if (put_old_timespec32(ts, restart->nanosleep.compat_rmtp))
//			return -EFAULT;
//		break;
//#endif
//	case TT_NATIVE:
//		if (put_timespec64(ts, restart->nanosleep.rmtp))
//			return -EFAULT;
//		break;
//	default:
//		BUG();
//	}
//	return -ERESTART_RESTARTBLOCK;
//}

//static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
//{
//	struct restart_block *restart;

//	do {
//		set_current_state(TASK_INTERRUPTIBLE);
//		hrtimer_sleeper_start_expires(t, mode);

//		if (likely(t->task))
//			freezable_schedule();

//		hrtimer_cancel(&t->timer);
//		mode = HRTIMER_MODE_ABS;

//	} while (t->task && !signal_pending(current));

//	__set_current_state(TASK_RUNNING);

//	if (!t->task)
//		return 0;

//	restart = &current->restart_block;
//	if (restart->nanosleep.type != TT_NONE) {
//		ktime_t rem = hrtimer_expires_remaining(&t->timer);
//		struct timespec64 rmt;

//		if (rem <= 0)
//			return 0;
//		rmt = ktime_to_timespec64(rem);

//		return nanosleep_copyout(restart, &rmt);
//	}
//	return -ERESTART_RESTARTBLOCK;
//}

//static long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
//{
//	struct hrtimer_sleeper t;
//	int ret;

//	hrtimer_init_sleeper_on_stack(&t, restart->nanosleep.clockid,
//				      HRTIMER_MODE_ABS);
//	hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
//	ret = do_nanosleep(&t, HRTIMER_MODE_ABS);
//	destroy_hrtimer_on_stack(&t.timer);
//	return ret;
//}

//long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode,
//		       const clockid_t clockid)
//{
//	struct restart_block *restart;
//	struct hrtimer_sleeper t;
//	int ret = 0;
//	u64 slack;

//	slack = current->timer_slack_ns;
//	if (dl_task(current) || rt_task(current))
//		slack = 0;

//	hrtimer_init_sleeper_on_stack(&t, clockid, mode);
//	hrtimer_set_expires_range_ns(&t.timer, rqtp, slack);
//	ret = do_nanosleep(&t, mode);
//	if (ret != -ERESTART_RESTARTBLOCK)
//		goto out;

//	/* Absolute timers do not update the rmtp value and restart: */
//	if (mode == HRTIMER_MODE_ABS) {
//		ret = -ERESTARTNOHAND;
//		goto out;
//	}

//	restart = &current->restart_block;
//	restart->nanosleep.clockid = t.timer.base->clockid;
//	restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer);
//	set_restart_fn(restart, hrtimer_nanosleep_restart);
//out:
//	destroy_hrtimer_on_stack(&t.timer);
//	return ret;
//}

//#ifdef CONFIG_64BIT

//SYSCALL_DEFINE2(nanosleep, struct __kernel_timespec __user *, rqtp,
//		struct __kernel_timespec __user *, rmtp)
//{
//	struct timespec64 tu;

//	if (get_timespec64(&tu, rqtp))
//		return -EFAULT;

//	if (!timespec64_valid(&tu))
//		return -EINVAL;

//	current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
//	current->restart_block.nanosleep.rmtp = rmtp;
//	return hrtimer_nanosleep(timespec64_to_ktime(tu), HRTIMER_MODE_REL,
//				 CLOCK_MONOTONIC);
//}

//#endif

//#ifdef CONFIG_COMPAT_32BIT_TIME

//SYSCALL_DEFINE2(nanosleep_time32, struct old_timespec32 __user *, rqtp,
//		       struct old_timespec32 __user *, rmtp)
//{
//	struct timespec64 tu;

//	if (get_old_timespec32(&tu, rqtp))
//		return -EFAULT;

//	if (!timespec64_valid(&tu))
//		return -EINVAL;

//	current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
//	current->restart_block.nanosleep.compat_rmtp = rmtp;
//	return hrtimer_nanosleep(timespec64_to_ktime(tu), HRTIMER_MODE_REL,
//				 CLOCK_MONOTONIC);
//}
//#endif

///*
// * Functions related to boot-time initialization:
// */
//int hrtimers_prepare_cpu(unsigned int cpu)
//{
//	struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
//	int i;

//	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
//		struct hrtimer_clock_base *clock_b = &cpu_base->clock_base[i];

//		clock_b->cpu_base = cpu_base;
//		seqcount_raw_spinlock_init(&clock_b->seq, &cpu_base->lock);
//		timerqueue_init_head(&clock_b->active);
//	}

//	cpu_base->cpu = cpu;
//	cpu_base->active_bases = 0;
//	cpu_base->hres_active = 0;
//	cpu_base->hang_detected = 0;
//	cpu_base->next_timer = NULL;
//	cpu_base->softirq_next_timer = NULL;
//	cpu_base->expires_next = KTIME_MAX;
//	cpu_base->softirq_expires_next = KTIME_MAX;
//	hrtimer_cpu_base_init_expiry_lock(cpu_base);
//	return 0;
//}

//#ifdef CONFIG_HOTPLUG_CPU

//static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
//				struct hrtimer_clock_base *new_base)
//{
//	struct hrtimer *timer;
//	struct timerqueue_node *node;

//	while ((node = timerqueue_getnext(&old_base->active))) {
//		timer = container_of(node, struct hrtimer, node);
//		BUG_ON(hrtimer_callback_running(timer));
//		debug_deactivate(timer);

//		/*
//		 * Mark it as ENQUEUED not INACTIVE otherwise the
//		 * timer could be seen as !active and just vanish away
//		 * under us on another CPU
//		 */
//		__remove_hrtimer(timer, old_base, HRTIMER_STATE_ENQUEUED, 0);
//		timer->base = new_base;
//		/*
//		 * Enqueue the timers on the new cpu. This does not
//		 * reprogram the event device in case the timer
//		 * expires before the earliest on this CPU, but we run
//		 * hrtimer_interrupt after we migrated everything to
//		 * sort out already expired timers and reprogram the
//		 * event device.
//		 */
//		enqueue_hrtimer(timer, new_base, HRTIMER_MODE_ABS);
//	}
//}

//int hrtimers_dead_cpu(unsigned int scpu)
//{
//	struct hrtimer_cpu_base *old_base, *new_base;
//	int i;

//	BUG_ON(cpu_online(scpu));
//	tick_cancel_sched_timer(scpu);

//	/*
//	 * this BH disable ensures that raise_softirq_irqoff() does
//	 * not wakeup ksoftirqd (and acquire the pi-lock) while
//	 * holding the cpu_base lock
//	 */
//	local_bh_disable();
//	local_irq_disable();
//	old_base = &per_cpu(hrtimer_bases, scpu);
//	new_base = this_cpu_ptr(&hrtimer_bases);
//	/*
//	 * The caller is globally serialized and nobody else
//	 * takes two locks at once, deadlock is not possible.
//	 */
//	raw_spin_lock(&new_base->lock);
//	raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);

//	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
//		migrate_hrtimer_list(&old_base->clock_base[i],
//				     &new_base->clock_base[i]);
//	}

//	/*
//	 * The migration might have changed the first expiring softirq
//	 * timer on this CPU. Update it.
//	 */
//	hrtimer_update_softirq_timer(new_base, false);

//	raw_spin_unlock(&old_base->lock);
//	raw_spin_unlock(&new_base->lock);

//	/* Check, if we got expired work to do */
//	__hrtimer_peek_ahead_timers();
//	local_irq_enable();
//	local_bh_enable();
//	return 0;
//}

//#endif /* CONFIG_HOTPLUG_CPU */

//void __init hrtimers_init(void)
//{
//	hrtimers_prepare_cpu(smp_processor_id());
//	open_softirq(HRTIMER_SOFTIRQ, hrtimer_run_softirq);
//}

///**
// * schedule_hrtimeout_range_clock - sleep until timeout
// * @expires:	timeout value (ktime_t)
// * @delta:	slack in expires timeout (ktime_t)
// * @mode:	timer mode
// * @clock_id:	timer clock to be used
// */
//int __sched
//schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta,
//			       const enum hrtimer_mode mode, clockid_t clock_id)
//{
//	struct hrtimer_sleeper t;

//	/*
//	 * Optimize when a zero timeout value is given. It does not
//	 * matter whether this is an absolute or a relative time.
//	 */
//	if (expires && *expires == 0) {
//		__set_current_state(TASK_RUNNING);
//		return 0;
//	}

//	/*
//	 * A NULL parameter means "infinite"
//	 */
//	if (!expires) {
//		schedule();
//		return -EINTR;
//	}

//	hrtimer_init_sleeper_on_stack(&t, clock_id, mode);
//	hrtimer_set_expires_range_ns(&t.timer, *expires, delta);
//	hrtimer_sleeper_start_expires(&t, mode);

//	if (likely(t.task))
//		schedule();

//	hrtimer_cancel(&t.timer);
//	destroy_hrtimer_on_stack(&t.timer);

//	__set_current_state(TASK_RUNNING);

//	return !t.task ? 0 : -EINTR;
//}

///**
// * schedule_hrtimeout_range - sleep until timeout
// * @expires:	timeout value (ktime_t)
// * @delta:	slack in expires timeout (ktime_t)
// * @mode:	timer mode
// *
// * Make the current task sleep until the given expiry time has
// * elapsed. The routine will return immediately unless
// * the current task state has been set (see set_current_state()).
// *
// * The @delta argument gives the kernel the freedom to schedule the
// * actual wakeup to a time that is both power and performance friendly.
// * The kernel give the normal best effort behavior for "@expires+@delta",
// * but may decide to fire the timer earlier, but no earlier than @expires.
// *
// * You can set the task state as follows -
// *
// * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
// * pass before the routine returns unless the current task is explicitly
// * woken up, (e.g. by wake_up_process()).
// *
// * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
// * delivered to the current task or the current task is explicitly woken
// * up.
// *
// * The current task state is guaranteed to be TASK_RUNNING when this
// * routine returns.
// *
// * Returns 0 when the timer has expired. If the task was woken before the
// * timer expired by a signal (only possible in state TASK_INTERRUPTIBLE) or
// * by an explicit wakeup, it returns -EINTR.
// */
//int __sched schedule_hrtimeout_range(ktime_t *expires, u64 delta,
//				     const enum hrtimer_mode mode)
//{
//	return schedule_hrtimeout_range_clock(expires, delta, mode,
//					      CLOCK_MONOTONIC);
//}
//EXPORT_SYMBOL_GPL(schedule_hrtimeout_range);

///**
// * schedule_hrtimeout - sleep until timeout
// * @expires:	timeout value (ktime_t)
// * @mode:	timer mode
// *
// * Make the current task sleep until the given expiry time has
// * elapsed. The routine will return immediately unless
// * the current task state has been set (see set_current_state()).
// *
// * You can set the task state as follows -
// *
// * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
// * pass before the routine returns unless the current task is explicitly
// * woken up, (e.g. by wake_up_process()).
// *
// * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
// * delivered to the current task or the current task is explicitly woken
// * up.
// *
// * The current task state is guaranteed to be TASK_RUNNING when this
// * routine returns.
// *
// * Returns 0 when the timer has expired. If the task was woken before the
// * timer expired by a signal (only possible in state TASK_INTERRUPTIBLE) or
// * by an explicit wakeup, it returns -EINTR.
// */
//int __sched schedule_hrtimeout(ktime_t *expires,
//			       const enum hrtimer_mode mode)
//{
//	return schedule_hrtimeout_range(expires, 0, mode);
//}
//EXPORT_SYMBOL_GPL(schedule_hrtimeout);
